| Redwood City to Smolyan | 6,587.83 mi (10,602.08 km) |
| Redwood City to Sofia | 6,487.59 mi (10,440.76 km) |
| Redwood City to Sopot | 6,522.55 mi (10,497.03 km) |
| Redwood City to Sozopol | 6,599.77 mi (10,621.31 km) |
| Redwood City to Sredets | 6,593.72 mi (10,611.57 km) |
| Redwood City to Stamboliyski | 6,549.88 mi (10,541.02 km) |
| Redwood City to Stara Zagora | 6,555.71 mi (10,550.39 km) |
| Redwood City to Svilengrad | 6,609.35 mi (10,636.72 km) |
| Redwood City to Svishtov | 6,475.25 mi (10,420.91 km) |
| Redwood City to Targovishte | 6,524.19 mi (10,499.67 km) |
| Redwood City to Teteven | 6,495.27 mi (10,453.13 km) |
| Redwood City to Troyan | 6,507.29 mi (10,472.47 km) |
| Redwood City to Tryavna | 6,525.34 mi (10,501.53 km) |
| Redwood City to Tutrakan | 6,474.51 mi (10,419.71 km) |
| Redwood City to Varna | 6,553.43 mi (10,546.73 km) |
